CVE Tools
Sign in

CVE-2009-4491

Published: Jan 13, 2010Updated: Apr 23, 2026 Sources: CVE List NVDCWE-20
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
13.5%
Top 4.0%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
No Fix Available

Description

thttpd 2.25b0 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-20CWE-94

Affected Products

thttpdacme
On-prem
Networking Infrastructure / load-balancer-proxy
n/an/a
acmeoss-projectNetworking Infrastructureaka thttpd, mini httpd, micro httpd

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

http://packetstormsecurity.com/files/175949/m-privacy-TightGate-Pro-Code-Execution-Insecure-Permissions.html
packetstormsecurity.com
http://seclists.org/fulldisclosure/2023/Nov/13
seclists.org
http://www.securityfocus.com/archive/1/508830/100/0/threaded
securityfocus.com
and 1 more references View all →

Timeline

Published
Jan 13, 2010
Last Updated
Apr 23, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2009-4491 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows